CC i GERMINATION. OF SEED^. 



of the bent tube in the liquor the whole time, aucl suffering 

 it to resume its proper form very slowly. Care should also 

 # be taken during the operation, to hold the apparatus iirraly 



at the junction of the tubes with one hand, or cautiously 

 with both ; as, when the greater part or the whole of the 

 gas is likely to be absorbed, and it goes on rapidly, the gra- 

 duated tube will, in consequence of the pressure, some-, 

 times fly ofF violently from the other, and perhaps be bro- 



Eadfomemj ^en. j a making the impregnated solution of sulphate of 

 iron with nitrous gas, I dissolve good soft iron in small 

 pieces to saturation, in the purest sulphuric acid I can get, 

 diluted, with about twice its weight of water. The nitric 

 acid is more manageable than the nitrous, and preferable 

 for procuring the nitric oxide to impregnate the iron sul- 

 phate, Avhicli may be easily done with a wide mouthed bot- 

 tle in a common basin. 



IRstttfeii when j t sometimes happens, when analysing air containing but 



ofoxigiiMithe btue oxigen gas, a great deal ot nitric oxide is extricated; 



•iris small. much more than can be contained in the graduated tube, 

 so that some difficulty arises in attempting to transfer it. 

 In such a case I suffer all the gas to. ascend into the elastic 

 bottle % then under mercury take out the tube, fill it with 

 the sulphated solution of iron, replace it, and thus the ni- 

 tric oxide is again separated, and the experiment, com- 

 pleted ; care being taken during the time to hold the bottle 

 in such a position, as will prevent the escape of any air. 



Experiment g 8# Tne ] 4th of M arcQ temp# 40 ° pre ^ 09.05. 



ing barley ia In these processes it may not be unnecessary to mention, 

 oxigen gas. jh a j- t ne j ars use( ] were graduated with the nicest accuracy 

 into coble inches and tenths, by putting into them repeat- 

 edly the weight of the e measures in grains of quicksilver, 

 and then dra. ing a line w-th the diamond. The internal 

 diameter of the largest is not more than 2 in lies, and of 

 the others about an inch. A quantity of freshly germinate 

 ing barley, weighing 760 gr«.,the radicles protruding about 

 a quarter of an inch, were conveyed in a coarse gauze bag 

 through the mercury into one of these jars inverted, con- 

 taining 17*20 cubjc inches of oxigen gas, prepared from 

 the oxigenated muriate of potash, and of 97 per cent pu- 

 rity; the greatest pains being taken, when the seeds were 



under 



